Sheet Rainbow at 15 Miles
JUST as the sun came up, lighting up that 15 mile distant ridge. Bright sunlight was about 10 feet over my head at the time. Less than aminute before I was lit up by the sun for my timeline.. In the distance the bright was working it’s way down the hill sides. The rain in the distance was far enough away to be a worth telephoto image. I was well over 200 yards out from Momma Angus to get her in focus along with the background with this long lens. Distance is your friend.
OK, another F-stop discussion…. High F-stop numbers take away a LOT of light from your light capture boxes. (camera). The higher the number, the smaller the hole in the lens for light to travel through. At the same time you make that hole smaller by turning up the F-stop number, you are thickening the “depth of field” focus depth. F-stop becomes a double edged sword. You can open up the aperture (turn down the f-stop number) and get a lot more light versus a pin hole at maximum fstop setting. But you loose depth of field/focus depth) So Bigger hole in the lens= shallow depth of field but a lot of light. A smaller hole in the aperture means less light but it gives you the ability to focus on things close AND far at the same time.
SO, you have to compensate for HIGH f stop numbers by adjusting the other two settings. Turning up camera sensitivity (ISO) boosts what little light that comes through a small hole in the lens. IT’s a double edge sword too though. More Camera Sensitivity (higher ISO) will give you a grainy image and introduce color noise. Speckles and big grain are not desirable so moderation is necessary.
Lastly you have shutter speed. Slower than 100th of a second you risk blurring the cow. Any movement from her would blur under longer exposures. Rule of thumb is 1/100th for minimum handheld telephoto (rested).
Title: Sheet Rainbow at 15 Miles